Backstage: Unsupported catalog cluster authentication mode in kubernetes backend

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-106487
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-06 21:17:17 UTC
Updated2026-10-06 21:17:17 UTC
DescriptionBackstage is an open framework for building developer portals. Prior to 0.21.10, the @backstage/plugin-kubernetes-backend package is affected by unsupported catalog cluster authentication mode in kubernetes backend. Deployments using catalog cluster discovery may be affected when catalog contributors can create or modify kubernetes-cluster Resource entities. With the required endpoint permissions and pod RBAC, the backend can use its local in-cluster identity, potentially exposing Kubernetes resources readable by that identity. The credential is used only with the local in-cluster API endpoint and is not sent to the catalog-supplied endpoint. This issue is fixed in version 0.21.10.

Risk And Classification

Primary CVSS: v3.1 3.5 LOW from [email protected]

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N

Problem Types: CWE-441 | CWE-441 CWE-441: Unintended Proxy or Intermediary ('Confused Deputy')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary3.5LOWCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N
3.1CNADECLARED3.5LOWCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Backstage Backstage affected < 1.54.6 Not specified
CNA @backstage Plugin-kubernetes-backend affected < 0.21.10 Not specified

References

ReferenceSourceLinkTags
github.com/backstage/backstage/commit/c14f8be6908f0f719b16356e5492352311... [email protected] github.com
github.com/backstage/backstage/security/advisories/GHSA-h53x-hjx6-25gr [email protected] github.com
github.com/backstage/backstage/releases/tag/v1.54.6 [email protected] github.com
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